Magnetic anti-sag mount for leveler rolls



Nov. 20, 1962 e. BEARER MAGNETIC ANTI-SAG MOUNT FOR LEVELER ROLLS Filed Oct. 2'7. 1959 INVENTOR. K JMOZ? @WwL BY 4 241.... @da I 7 3,554,113 Patented Nov. 2%, 1952 E I at 3,064,713 Aniaat; MQ" no" son Filed Get. 27, me Ser. No. soar? oi. 153M195 4 liaims.

material that is relatively thin and of great width among the objects thereof to provide support for the relatively thin long working rolls to p: e ging in the center thereof when no mate ial is processed.

It is a further object of the invention to provide a. means for counteracting the weight of the upper work rolls at substantially the center thereof and to further retract said upper work rolls against their backup rollers when the machine is idling.

It is still a further object of the invention to provide magnetic means acting upon the upper work rolls to maintain their normal alignment.

These and other objects of the invention will become more apparent from a consideration of the accompanying drawing constituting a part hereof in which like reference characters designate like parts and in which:

FIGURE 1 is a transverse vertical section, partially in elevation, of a roller leveler embodying the principles of this invention;

FIGURE 2, a cross section taken along the line 22 of FIGURE 1; and

FIGURE 3 is a diagrammatic view or" an electromagnetic coil power circuit.

in the drawing, the numerals 1 and 2 designate side frames of a roller leveler with a cross frame 3 supported thereon, a plurality of rolls 4 and 5 are journaled in the side frames 1 and 2 at 6-6' and 77, respectively. These rolls are the Work rolls for leveling sheet material and may be as long as 96" or 8 and of a relatively small diameter such as 1 They are supported by backup rolls 8 that are arranged in pairs mounted on depending portions 9 of the cross frame 3 and in staggered relation, as shown in FIGURE 2 of the drawing. The bottom roll 5 is similarly supported by backup rolls designated by the numeral 11?.

As shown in FEGURE 2, the upper work rolls 4 sag, as shown by the dotted lines, when no material is in the pass between the upper and lower rolls. When a sheet of material is entered between the upper and lower rolls 4 and 5, the upper rolls, because of sagging, are jolted up against their backup rollers 8. The resulting impact produces skid marks on the work rolls 4 which in turn mark the product.

In avoidance of this, the sag of the upper rolls is eliminated by the use of electromagnets which consist of an iron or steel yoke 11 having electromagnetic coils 12 and 13 mounted on the legs thereof. The yokes are supported on a non-magnetic cross piece 14 which is adjustably mounted by a threaded hanger 14a to vary the air gap A at 15 and 16. The coils 12 and 13 are connected to a source of electrical energy 17 and 18 to be energized to set up a magnetic field which attracts the upper work roll 4- and raises it against the upper supporting work rolls 8 in the manner shown in the drawings.

As shown in PZGURE 1, there is an air gap 15 and 16 between the leg of the magnet and the surface of the upper work roll. In FIGURE 2, a series of magnetic yokes are shown, one for each ofv the upper work rolls in the roller leveler.

Instead of electromagnets, as shown, permanent mag- 2 nets may be employed to retract the upper work rolls and hold them against their supporting backup rollers 3.

By means of the electromagnetic coils for the upper work rolls, the rolls are effectively lifted. We have found that with the poles 6" apart the coils placed 4" from the pole faces, efiective lif ig will result. By means of netic roll lilting de cos, the cobbling of the sheet in bending or bre of the leveling rolls has been eliminated and a better product results. Generally speaking, long slender work rolls are more commonly used in non-ferrous industries where magnetic influences have no effect on the sheet metal worked on. It is evident from the foregoing description of this invention that roller levelers embodying the magnetic roll lifting devices are of simple construction and readily adapted to modern roller leveler design.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

1 claim:

1. In a roller leveler, a plurality of relatively long upper and lower work rolls staggered and nested to receive a strip of sheet metal therebetween, backup rolls for said work rolls and means for establishing a magnetic field between the ends and above said upper work rolls at substantially the center thereof to draw said upper work rolls against their backup rolls.

2. In a roller leveler, a plurality of relatively long upper and lower work rolls journalled at their ends only, and staggered and nested to receive a strip of sheet metal therebetween, groups of backup rolls for both the upper and lower work rolls spaced axially of said work rolls, and means for establishing a magnetic field between the ends and above said upper work rolls at substantially the center thereof to draw said upper work rolls against their backup rolls.

3. A roller leveler as set forth in claim 1 in which the magnetic field is provided by an electromagnet of substantially inverted U-shape having the ends of its poles spaced from said upper work rolls to be out of contact therewith when engaging its backup rolls and coils on said poles for establishing an electromagnetic field across the poles.

4. A roller leveler as set forth in claim 1 in which the magnetic field is provided by an electromagnet of substantially inverted U-shape having the ends of its poles spaced from said upper Work rolls to be out of contact therewith when engaging its backup rolls and coils on said poles for establishing an electromagnetic field across the poles, said electromagnets being suspended from the upper roller supporting frame by a non-metallic cross member.

References Cited in the file of this patent UNITED STATES PATENTS 408,465 Dewey Aug. 6, 1889 1,171,818 Walpole Feb. 16, 1918 1,937,216 Bahney Nov. 28, 1933 2,100,587 Chalker Nov. 30, 1937 2,279,347 Simons Apr. 14, 1942 2,295,017 Shields Sept. 8, 1942 2,381,730 Ellis Aug. 7, 1945 2,393,243 Franz Jan. 22, 1946 2,852,065 Peterson Sept. 16, 1958 FOREIGN PATENTS 1,086,496 France Aug. 11, 1954 57,447 Germany July 8, 1891 

